ARM: dts: omap443x: Correct sgx clock to 307.2MHz as used on motorola vendor kernel

The Android vendor kernel uses 307.2MHz or a divider ratio of /5 while active
153600000 or /10 is only used when the sgx core is inactive.

Signed-off-by: Carl Philipp Klemm <philipp@uvos.xyz>
Signed-off-by: Tony Lindgren <tony@atomide.com>