mmc: Fix write_bl_len calculation

Use extract_uint32_bits like other fields:

Previous: 128 - ((3 + 1 ) * 23 - 22) bit = 22:
 with mask 0xf we read 25:22
Newer: function returns 127 - (102 + 0) .. 127 - (102 + 3) = 25:22

BRANCH=None
BUG=None
TEST=compile

Change-Id: I435644e6178a73ee79383c302c4526807a3b6e3b
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/312748
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
1 file changed