arm: omap2: Drop obsolete MACH_OMAP3_PANDORA entry

The MACH_OMAP3_PANDORA is no longer referenced anywhere in the kernel
options so it can now be dropped as the board has long moved to DT.
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/Kconfig

@@ -204,12 +204,6 @@ config MACH_OMAP2_TUSB6010
 	depends on ARCH_OMAP2 && SOC_OMAP2420
 	default y if MACH_NOKIA_N8X0
 
-config MACH_OMAP3_PANDORA
-	bool "OMAP3 Pandora"
-	depends on ARCH_OMAP3
-	default y
-	select OMAP_PACKAGE_CBB
-
 config MACH_NOKIA_N810
        bool