ARM: s5pc100_defconfig: change ARCH_S5PC1XX to ARCH_S5PC100

Fixup the defconfig post the latest moves, so ARCH_S5PC1XX becomes
ARCH_S5PC100 which is sufficient to get the system building.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/configs/s5pc100_defconfig

@@ -171,7 +171,7 @@ CONFIG_DEFAULT_IOSCHED="cfq"
 # CONFIG_ARCH_SA1100 is not set
 # CONFIG_ARCH_S3C2410 is not set
 # CONFIG_ARCH_S3C64XX is not set
-CONFIG_ARCH_S5PC1XX=y
+CONFIG_ARCH_S5PC100=y
 # CONFIG_ARCH_SHARK is not set
 # CONFIG_ARCH_LH7A40X is not set
 # CONFIG_ARCH_U300 is not set