ARM: rmobile: Enable HUSH on M2 Porter

Enable the HUSH shell, since it is far more capable.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

configs/porter_defconfig

@@ -37,6 +37,7 @@ CONFIG_TPL_SPI_FLASH_SUPPORT=y
 CONFIG_TPL_SPI_LOAD=y
 CONFIG_TPL_SPI_SUPPORT=y
 CONFIG_TPL_YMODEM_SUPPORT=y
+CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_XIMG is not set