ARM: dts: da850-evm: add WP and CD to MMC

The legacy mode uses the write protect and card detect but DT does not.
This patch enables Write-Protect and Card-Detect pins for the MMC card, and
the gpio-ranges property sets the gpio pinmuxing for those respective pins.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>