clk.h: inline clk_get_by_name()

Fix compile warning for non OF_CONTROL builds:

---8<---
In file included from /Volumes/devel/u-boot/drivers/gpio/atmel_pio4.c:10:0:
/Volumes/devel/u-boot/include/clk.h:107:12: warning: 'clk_get_by_name' defined but not used [-Wunused-function]
--->8---

Signed-off-by: Andreas Bießmann <andreas@biessmann.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
1 file changed