[][drivers: spi-mem: Add spi calibration hook]

[Description]
Add spi calibration hook.

[Release-log]
N/A

Change-Id: Ia904e6d5e6b5c03298a4321eda88a84ef3c7cf1b
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6151754
1 file changed