powerpc/configs: Drop unnecessary CONFIG_EDAC from ppc64e

There are no EDAC drivers for ppc64e.
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

arch/powerpc/configs/ppc64e_defconfig

@@ -170,7 +170,6 @@ CONFIG_INFINIBAND=m
 CONFIG_INFINIBAND_MTHCA=m
 CONFIG_INFINIBAND_IPOIB=m
 CONFIG_INFINIBAND_ISER=m
-CONFIG_EDAC=y
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_DS1307=y
 CONFIG_EXT2_FS=y