mmc: tegra: change the drv_type variable data type to int

mmc: tegra: change the drv_type variable  data type to int

Changed the data type of variable drv_type to int since
drive type values are passed in the form of
hex decimal values as below
Drive strength Type B: 0x0
Drive strength Type A: 0x1
Drive strength Type C: 0x2
Drive strength Type D: 0x3

Bug 200078454

Change-Id: Idd45cd7746657a2273cb75eb136854a31adb359f
Reviewed-on: http://git-master/r/707716
(cherry picked from commit 2be24a51352db4d8e2c78febb9c252e8521a03f5)

Signed-off-by: R Raj Kumar <rrajk@nvidia.com>
Change-Id: Idf01be5edf2ad0b5fc4212dd29d4923391a07567
Reviewed-on: http://git-master/r/714665
Reviewed-by: Venu Byravarasu <vbyravarasu@nvidia.com>