ARM: OMAP2+: split omap2/3/4_check_revision function

We need to detect the SoC revision early, but the SoC
feature detection can be done later on. In order to allow
further clean-up later on, this patch separates the SoC
revision check from the SoC feature check.

This patch doesn't change functionality or behavior of the code
execution; it barely cleans up the code and splits into SoC
specific implementation for Rev ID and feature detection.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
[tony@atomide.com: updated comments]
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/plat-omap/include/plat/cpu.h

@@ -451,7 +451,12 @@ IS_OMAP_TYPE(3517, 0x3517)
 #define OMAP447X_CLASS		0x44700044
 #define OMAP4470_REV_ES1_0	(OMAP447X_CLASS | (0x10 << 8))
 
-void omap2_check_revision(void);
+void omap2xxx_check_revision(void);
+void omap3xxx_check_revision(void);
+void omap4xxx_check_revision(void);
+void omap3xxx_check_features(void);
+void ti81xx_check_features(void);
+void omap4xxx_check_features(void);
 
 /*
  * Runtime detection of OMAP3 features