ARM: rmobile: alt: Synchronize defconfig

Synchronize the R8A7794 Alt defconfig, enable DM SPI, DM SPI FLASH
and I2C driver support.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
1 file changed