Blackfin: update some missed board config.mk files

Seems these two files were missed during the big lib shuffle.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

board/bf527-ad7160-eval/config.mk

@@ -26,8 +26,8 @@
 # This is not actually used for Blackfin boards so do not change it
 #TEXT_BASE = do-not-use-me
 
-CFLAGS_lib_generic += -O2
-CFLAGS_lzma += -O2
+CFLAGS_lib += -O2
+CFLAGS_lib/lzma += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS += $(LDR_FLAGS-$(CONFIG_BFIN_BOOT_MODE))

board/ip04/config.mk

@@ -26,8 +26,8 @@
 # This is not actually used for Blackfin boards so do not change it
 #TEXT_BASE = do-not-use-me
 
-CFLAGS_lib_generic += -O2
-CFLAGS_lzma += -O2
+CFLAGS_lib += -O2
+CFLAGS_lib/lzma += -O2
 
 # Set some default LDR flags based on boot mode.
 LDR_FLAGS-BFIN_BOOT_PARA := --bits 16 --dma 8