esdhc: memset mmc struct before putting into use

esdhc: memset mmc struct before putting into use

struct mmc should be clear to all '0' after malloc to avoid
unexpect variable value.

Like mmc->has_init = xxx.
In this case mmcinfo will believe the card had been initialized before
and skip the initialization.

Test on P5040 and T4240,
Error Log:

=> mmcinfo
Device: FSL_SDHC
Manufacturer ID: 0
OEM: 0
Name: Tran Speed: 0
Rd Block Len: 0
MMC version 0.0
High Capacity: No
Capacity: 0 Bytes
Bus Width: 0-bit
=>

Signed-off-by: Haijun Zhang <[email protected]>
Signed-off-by: Xie Shaohui-B21989 <[email protected]>
Tested-by: Ryan Barnett <[email protected]>
Acked-by: Pantelis Antoniou <[email protected]>