ARM: OMAP2+: remove obsolete config OMAP3_SDRC_AC_TIMING

Commit d42f265a ("ARM: OMAP3: clock: remove un-used core dpll
re-program code") removes arch/arm/mach-omap2/sram34xx.S, which
implemented the effect of the config OMAP3_SDRC_AC_TIMING. Since then, the
OMAP3_SDRC_AC_TIMING config was hanging around without effect.

Remove this obsolete config.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Message-Id: <20230320083806.9545-1-lukas.bulwahn@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/Kconfig

@@ -255,17 +255,6 @@ config MACH_NOKIA_N8X0
 	select MACH_NOKIA_N810
 	select MACH_NOKIA_N810_WIMAX
 
-config OMAP3_SDRC_AC_TIMING
-	bool "Enable SDRC AC timing register changes"
-	depends on ARCH_OMAP3
-	help
-	  If you know that none of your system initiators will attempt to
-	  access SDRAM during CORE DVFS, select Y here.  This should boost
-	  SDRAM performance at lower CORE OPPs.  There are relatively few
-	  users who will wish to say yes at this point - almost everyone will
-	  wish to say no.  Selecting yes without understanding what is
-	  going on could result in system crashes;
-
 endmenu
 
 endif