powerpc/83xx: add RTC drivers in 83xx defconfig

83xx boards typically have the DS1307 or DS1374:

git grep RTC_DRV arch/powerpc/configs/*83* | grep "=y"
arch/powerpc/configs/83xx/asp8347_defconfig:CONFIG_RTC_DRV_DS1374=y
arch/powerpc/configs/83xx/mpc8313_rdb_defconfig:CONFIG_RTC_DRV_DS1307=y
arch/powerpc/configs/83xx/mpc8315_rdb_defconfig:CONFIG_RTC_DRV_DS1307=y
arch/powerpc/configs/83xx/mpc832x_mds_defconfig:CONFIG_RTC_DRV_DS1374=y
arch/powerpc/configs/83xx/mpc834x_itx_defconfig:CONFIG_RTC_DRV_DS1307=y
arch/powerpc/configs/83xx/mpc834x_itxgp_defconfig:CONFIG_RTC_DRV_DS1307=y
arch/powerpc/configs/83xx/mpc834x_mds_defconfig:CONFIG_RTC_DRV_DS1374=y
arch/powerpc/configs/83xx/mpc836x_mds_defconfig:CONFIG_RTC_DRV_DS1374=y

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/configs/mpc83xx_defconfig

@@ -980,8 +980,6 @@ CONFIG_LEGACY_PTY_COUNT=256
 CONFIG_HW_RANDOM=y
 # CONFIG_HW_RANDOM_TIMERIOMEM is not set
 # CONFIG_NVRAM is not set
-CONFIG_GEN_RTC=y
-# CONFIG_GEN_RTC_X is not set
 # CONFIG_R3964 is not set
 # CONFIG_APPLICOM is not set
 # CONFIG_RAW_DRIVER is not set
@@ -1372,7 +1370,65 @@ CONFIG_USB_EHCI_HCD_PPC_OF=y
 # CONFIG_ACCESSIBILITY is not set
 # CONFIG_INFINIBAND is not set
 # CONFIG_EDAC is not set
-# CONFIG_RTC_CLASS is not set
+CONFIG_RTC_LIB=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_HCTOSYS=y
+CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
+# CONFIG_RTC_DEBUG is not set
+
+#
+# RTC interfaces
+#
+CONFIG_RTC_INTF_SYSFS=y
+CONFIG_RTC_INTF_PROC=y
+CONFIG_RTC_INTF_DEV=y
+# CONFIG_RTC_INTF_DEV_UIE_EMUL is not set
+# CONFIG_RTC_DRV_TEST is not set
+
+#
+# I2C RTC drivers
+#
+CONFIG_RTC_DRV_DS1307=y
+CONFIG_RTC_DRV_DS1374=y
+# CONFIG_RTC_DRV_DS1672 is not set
+# CONFIG_RTC_DRV_MAX6900 is not set
+# CONFIG_RTC_DRV_RS5C372 is not set
+# CONFIG_RTC_DRV_ISL1208 is not set
+# CONFIG_RTC_DRV_X1205 is not set
+# CONFIG_RTC_DRV_PCF8563 is not set
+# CONFIG_RTC_DRV_PCF8583 is not set
+# CONFIG_RTC_DRV_M41T80 is not set
+# CONFIG_RTC_DRV_BQ32K is not set
+# CONFIG_RTC_DRV_S35390A is not set
+# CONFIG_RTC_DRV_FM3130 is not set
+# CONFIG_RTC_DRV_RX8581 is not set
+# CONFIG_RTC_DRV_RX8025 is not set
+
+#
+# SPI RTC drivers
+#
+
+#
+# Platform RTC drivers
+#
+# CONFIG_RTC_DRV_CMOS is not set
+# CONFIG_RTC_DRV_DS1286 is not set
+# CONFIG_RTC_DRV_DS1511 is not set
+# CONFIG_RTC_DRV_DS1553 is not set
+# CONFIG_RTC_DRV_DS1742 is not set
+# CONFIG_RTC_DRV_STK17TA8 is not set
+# CONFIG_RTC_DRV_M48T86 is not set
+# CONFIG_RTC_DRV_M48T35 is not set
+# CONFIG_RTC_DRV_M48T59 is not set
+# CONFIG_RTC_DRV_MSM6242 is not set
+# CONFIG_RTC_DRV_BQ4802 is not set
+# CONFIG_RTC_DRV_RP5C01 is not set
+# CONFIG_RTC_DRV_V3020 is not set
+
+#
+# on-CPU RTC drivers
+#
+# CONFIG_RTC_DRV_GENERIC is not set
 # CONFIG_DMADEVICES is not set
 # CONFIG_AUXDISPLAY is not set
 # CONFIG_UIO is not set