powerpc: Fix CamelCase checkpatch warnings

85xx, 86xx PowerPC folders have code variables with CamelCase naming conventions.
because of this code checkpatch script generates "WARNING: Avoid CamelCase".

Convert variables name to normal naming convention and modify board, driver
files with updated the new structure.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/mpc8540ads/mpc8540ads.c b/board/freescale/mpc8540ads/mpc8540ads.c
index 7a84cd2..2fb4037 100644
--- a/board/freescale/mpc8540ads/mpc8540ads.c
+++ b/board/freescale/mpc8540ads/mpc8540ads.c
@@ -68,7 +68,7 @@
 
 	get_sys_info(&sysinfo);
 	clkdiv = lbc->lcrr & LCRR_CLKDIV;
-	lbc_hz = sysinfo.freqSystemBus / 1000000 / clkdiv;
+	lbc_hz = sysinfo.freq_systembus / 1000000 / clkdiv;
 
 	if (lbc_hz < 66) {
 		lbc->lcrr = CONFIG_SYS_LBC_LCRR | LCRR_DBYP;	/* DLL Bypass */