clk: samsung: Properly propagate flags in __PLL macro

All users of __PLL macro already provide flags parameter, so don't
overwrite it unconditionally with CLK_GET_RATE_NOCACHE.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>