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/drivers/spi/fsl_espi.c b/drivers/spi/fsl_espi.c
index c883d3c..7c84582 100644
--- a/drivers/spi/fsl_espi.c
+++ b/drivers/spi/fsl_espi.c
@@ -75,7 +75,7 @@
 
 	/* Set eSPI BRG clock source */
 	get_sys_info(&sysinfo);
-	spibrg = sysinfo.freqSystemBus / 2;
+	spibrg = sysinfo.freq_systembus / 2;
 	fsl->div16 = 0;
 	if ((spibrg / max_hz) > 32) {
 		fsl->div16 = ESPI_CSMODE_DIV16;