s5j/pwrcal: tidy up pwrcal framework, suitable for S5JT200

s5j/pwrcal: tidy up pwrcal framework, suitable for S5JT200

S5JT200 doesn't use dfs, gate function on pwrcal platform, evan pll is
non chagned its value during working. To fit with this small system,
pwrcal trashes lot of function except clock enable, and clock set/get
rate for S5JT200 system.

The clock display function needs lot of sub function. For size reduction
work, s5jt200_tash.c will not refer clock display function as well.

Fixes: d144ec33("s5jt200/pwrcal: tidy up a bitRemove S5JT200 directory, dfs functions")
Change-Id: Icea1752ed3fc6b05398dcaa153268f4a1fee3862
Signed-off-by: Jihoon Park <jh6186.park@samsung.com>