arch/non-x86: Flip HAVE_MONOTONIC_TIMER default

Also remove allwinner/a10 dummy monotonic_timer
implementation.

Change-Id: I9dfa9b92dc63375465e3bb87b73eeefad601c810
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34112
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/soc/mediatek/mt8173/Kconfig

@@ -8,8 +8,6 @@ config SOC_MEDIATEK_MT8173
 	select ARCH_VERSTAGE_ARMV8_64
 	select ARM64_USE_ARM_TRUSTED_FIRMWARE
 	select HAVE_UART_SPECIAL
-	select HAVE_MONOTONIC_TIMER
-	select GENERIC_UDELAY
 	select GENERIC_GPIO_LIB
 	select RTC
 

src/soc/mediatek/mt8183/Kconfig

@@ -6,9 +6,7 @@ config SOC_MEDIATEK_MT8183
 	select ARCH_ROMSTAGE_ARMV8_64
 	select ARCH_VERSTAGE_ARMV8_64
 	select ARM64_USE_ARM_TRUSTED_FIRMWARE
-	select GENERIC_UDELAY
 	select HAVE_UART_SPECIAL
-	select HAVE_MONOTONIC_TIMER
 	select COMPRESS_BOOTBLOCK
 
 if SOC_MEDIATEK_MT8183