ARM: sunxi: Re-enable SID driver in sunxi_defconfig

Commit 3d0b16a6 ("nvmem: sunxi: Move the SID driver to the nvmem
framework") moved the the sunxi SID driver to a new framework, but left
sunxi_defconfig with the deprecated config symbol EEPROM_SUNXI_SID
instead of the new symbol NVMEM_SUNXI_SID. Hence, re-enable the driver
in sunxi_defconfig.

Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>