mmc: increase delay between ACMD41 retries
mmc: increase delay between ACMD41 retries

In the SD Specification, Power Up Diagram of Card figure, the Timeout
value for initialization process (ACMD41 command retries) is 1 second.
Align to match MMC cards (in mmc_send_op_cond()) and Linux kernel code,
and set the delay between ACMD41 command retries to 10ms.

Change-Id: I2e07cb9944e7d7b72f2d4b13e0505e6751458091
Signed-off-by: Yann Gautier <e753f6969c288905606e3c07464886d4f1fc1be0@st.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware