ARM: enable LTO for some boards

Enable LTO for some boards that were tested by people on U-Boot Mailing
List.
Signed-off-by: NMarek Behún <marek.behun@nic.cz>
Tested-by: NAdam Ford <aford173@gmail.com>
Tested-by: NPali Rohár <pali@kernel.org>
Tested-by: NTim Harvey <tharvey@gateworks.com>

configs/am3517_evm_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 # CONFIG_SPL_USE_ARCH_MEMCPY is not set
 # CONFIG_SPL_USE_ARCH_MEMSET is not set

configs/da850evm_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_SYS_THUMB_BUILD=y
 CONFIG_ARCH_DAVINCI=y

configs/da850evm_direct_nor_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_CPU_INIT=y
 CONFIG_ARCH_DAVINCI=y

configs/da850evm_nand_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_SYS_THUMB_BUILD=y
 CONFIG_ARCH_DAVINCI=y

configs/imx6q_logic_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_MX6=y
 CONFIG_SYS_TEXT_BASE=0x17800000

configs/imx8mm_beacon_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_IMX8M=y
 CONFIG_SYS_TEXT_BASE=0x40200000

configs/imx8mm_venice_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_IMX8M=y
 CONFIG_SYS_TEXT_BASE=0x40200000

configs/imx8mn_beacon_2g_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_IMX8M=y
 CONFIG_SYS_TEXT_BASE=0x40200000

configs/imx8mn_beacon_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_IMX8M=y
 CONFIG_SYS_TEXT_BASE=0x40200000

configs/nokia_rx51_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 # CONFIG_SYS_THUMB_BUILD is not set
 CONFIG_ARCH_OMAP2PLUS=y

configs/omap3_logic_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 # CONFIG_SPL_USE_ARCH_MEMCPY is not set
 # CONFIG_SPL_USE_ARCH_MEMSET is not set

configs/r8a774a1_beacon_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_RMOBILE=y
 CONFIG_SYS_TEXT_BASE=0x50000000

configs/r8a774b1_beacon_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_RMOBILE=y
 CONFIG_SYS_TEXT_BASE=0x50000000

configs/r8a774e1_beacon_defconfig

+CONFIG_LTO=y
 CONFIG_ARM=y
 CONFIG_ARCH_RMOBILE=y
 CONFIG_SYS_TEXT_BASE=0x50000000