ARM: defconfig: drop CONFIG_MICROCHIP_PIT64B

This is now default-enabled when CONFIG_SOC_SAMA7 is
used, so the defconfig entry can be dropped.

Fixes: f611af4c ("ARM: at91: Kconfig: implement PIT64B selection")
Acked-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -1044,7 +1044,6 @@ CONFIG_MSM_MMCC_8960=y
 CONFIG_MSM_MMCC_8974=y
 CONFIG_HWSPINLOCK=y
 CONFIG_HWSPINLOCK_QCOM=y
-CONFIG_MICROCHIP_PIT64B=y
 CONFIG_BCM2835_MBOX=y
 CONFIG_QCOM_APCS_IPC=y
 CONFIG_QCOM_IPCC=y