mmc: davinci_mmc: Handle error for clk_enable

mmc: davinci_mmc: Handle error for clk_enable

BugLink: https://bugs.launchpad.net/bugs/1969110
[ Upstream commit 09e7af76db02c74f2a339b3cb2d95460fa2ddbe4 ]

As the potential failure of the clk_enable(),
it should be better to check it and return error
if fails.

Fixes: bbce5802afc5 ("davinci: mmc: updates to suspend/resume implementation")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20220308071415.1093393-1-jiasheng@iscas.ac.cn
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit f2b0fc2a46a630289a0c53fdc6135a4051145c99)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>