ARM: shmobile: defconfig: Replace USB_RCAR_GEN2_PHY by PHY_RCAR_GEN2

The legacy-only USB_RCAR_GEN2_PHY driver was replaced by the DT-only
PHY_RCAR_GEN2 driver.

Refresh the defconfig using "make savedefconfig" while we're at it.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>