[ARM] pxa/corgi: update default config to exclude tosa from being built

Signed-off-by: Eric Miao <eric.miao@marvell.com>

arch/arm/configs/corgi_defconfig

@@ -179,7 +179,7 @@ CONFIG_MACH_HUSKY=y
 # CONFIG_MACH_AKITA is not set
 # CONFIG_MACH_SPITZ is not set
 # CONFIG_MACH_BORZOI is not set
-CONFIG_MACH_TOSA=y
+# CONFIG_MACH_TOSA is not set
 # CONFIG_ARCH_VIPER is not set
 # CONFIG_ARCH_PXA_ESERIES is not set
 # CONFIG_TRIZEPS_PXA is not set