omap2/3: id: fix sparse warning

omap24xx_check_revision, omap3_check_features,
omap3_check_revision, omap4_check_revision, omap3_cpuinfo
are not used elsewhere, it should be static

Also fixes the following sparse warnings:
arch/arm/mach-omap2/id.c:105:13: warning: symbol 'omap24xx_check_revision'
was not declared. Should it be static?
arch/arm/mach-omap2/id.c:167:13: warning: symbol 'omap3_check_features'
was not declared. Should it be static?
arch/arm/mach-omap2/id.c:189:13: warning: symbol 'omap3_check_revision'
was not declared. Should it be static?
arch/arm/mach-omap2/id.c:270:13: warning: symbol 'omap4_check_revision'
was not declared. Should it be static?
arch/arm/mach-omap2/id.c:300:13: warning: symbol 'omap3_cpuinfo'
was not declared. Should it be static?

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/id.c

@@ -102,7 +102,7 @@ static struct omap_id omap_ids[] __initdata = {
 static void __iomem *tap_base;
 static u16 tap_prod_id;
 
-void __init omap24xx_check_revision(void)
+static void __init omap24xx_check_revision(void)
 {
 	int i, j;
 	u32 idcode, prod_id;
@@ -164,7 +164,7 @@ void __init omap24xx_check_revision(void)
 		omap3_features |= OMAP3_HAS_ ##feat;			\
 	}
 
-void __init omap3_check_features(void)
+static void __init omap3_check_features(void)
 {
 	u32 status;
 
@@ -186,7 +186,7 @@ void __init omap3_check_features(void)
 	 */
 }
 
-void __init omap3_check_revision(void)
+static void __init omap3_check_revision(void)
 {
 	u32 cpuid, idcode;
 	u16 hawkeye;
@@ -267,7 +267,7 @@ void __init omap3_check_revision(void)
 	}
 }
 
-void __init omap4_check_revision(void)
+static void __init omap4_check_revision(void)
 {
 	u32 idcode;
 	u16 hawkeye;
@@ -297,7 +297,7 @@ void __init omap4_check_revision(void)
 	if (omap3_has_ ##feat())		\
 		printk(#feat" ");
 
-void __init omap3_cpuinfo(void)
+static void __init omap3_cpuinfo(void)
 {
 	u8 rev = GET_OMAP_REVISION();
 	char cpu_name[16], cpu_rev[16];