drivers/rtc/rtc-s5m.c: fix info->rtc assignment

Fix this warning:

  drivers/rtc/rtc-s5m.c: In function `s5m_rtc_probe':
  drivers/rtc/rtc-s5m.c:545: warning: assignment from incompatible pointer type

struct s5m_rtc_info.rtc has type "struct regmap *", while
struct sec_pmic_dev.rtc has type "struct i2c_client *".

Probably the author wanted to assign "struct sec_pmic_dev.regmap", which
has the correct type.

Also, as "rtc" doesn't make much sense as a name for a regmap, rename it
to "regmap".

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>