cosmetic: replace MIN, MAX with min, max

The macro MIN, MAX is defined as the aliase of min, max,
respectively.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/board/freescale/common/ics307_clk.c b/board/freescale/common/ics307_clk.c
index 6789efb..e683be3 100644
--- a/board/freescale/common/ics307_clk.c
+++ b/board/freescale/common/ics307_clk.c
@@ -67,7 +67,7 @@
 				continue;
 			/* Calculate the temp out frequency */
 			tmp_out = input_freq * 2 * vdw / (rdw * od * 1000);
-			diff = MAX(out_freq, tmp_out) - MIN(out_freq, tmp_out);
+			diff = max(out_freq, tmp_out) - min(out_freq, tmp_out);
 			/*
 			 * calculate the percent, the precision is 1/1000
 			 * If greater than 1/1000, continue