ARM: multi_v7_defconfig: Enable debugging symbols by default

Similarly to the ARM64 defconfig, enable debugging symbols and rely upon
the toolchain's default DWARF implementation.

Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>

Author: ffainelli

arch/arm/configs/multi_v7_defconfig

@@ -1323,5 +1323,8 @@ CONFIG_CRYPTO_DEV_STM32_HASH=m
 CONFIG_CRYPTO_DEV_STM32_CRYP=m
 CONFIG_CMA_SIZE_MBYTES=64
 CONFIG_PRINTK_TIME=y
+CONFIG_DEBUG_KERNEL=y
+CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
+CONFIG_DEBUG_INFO_REDUCED=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_FS=y