OMAP3 kernels fail to build

[Russell King - ARM Linux]

With CONFIG_ARCH_OMAP3=y and CONFIG_ARCH_OMAP4=n, I'm getting this:

arch/arm/mach-omap2/built-in.o:(.data+0xf99c): undefined reference to `omap4430_phy_init'
arch/arm/mach-omap2/built-in.o:(.data+0xf9a0): undefined reference to `omap4430_phy_exit'
arch/arm/mach-omap2/built-in.o:(.data+0xf9a4): undefined reference to `omap4430_phy_power'
arch/arm/mach-omap2/built-in.o:(.data+0xf9a8): undefined reference to `omap4430_phy_set_clk'
arch/arm/mach-omap2/built-in.o:(.data+0xf9ac): undefined reference to `omap4430_phy_suspend'

This is probably from twl-common.c, which doesn't really look very
common to me (looks like some is specific to OMAP3 and the rest is
OMAP4 specific.)

As this is always built for all OMAP2+, this will also break OMAP2 as
well.  Why it's even built on OMAP2, I've no idea.

I think the OMAP3 specific bits should be separate from the OMAP4
specific bits, which should be separate from the small amount of
common stuff.

Please either fix ASAP, or revert the five changes for twl-common.c