[U-Boot] Commit 2108f4c4 causes a warning in 10 ARM boards

[Albert ARIBAUD]

Hi Rob,

Commit 2108f4c4 ("config: consolidate CONFIG_SYS_HZ definition") causes
the following boards:

	omap730p2_cs3boot omap730p2_cs0boot scb9328 palmtc balloon3
	mini2440 zipitz2 palmld omap730p2 omap3_zoom2 mx1ads

to emit this warning:

	time.c:12:2: warning: #warning "CONFIG_SYS_HZ must be 1000 and
	should not be defined by platforms" [-Wcpp]

Rob, can you look into it?

Tom: I am preparing a PR from ARM to u-boot; ARM build will obviously
fail for these 10 boards unless a fix is applied to u-boot/master before
I submit my PR.

Amicalement,
-- 
Albert.