omap-common: Rename set_muxconf_regs_essential to set_muxconf_regs

There is no distinction between essential and non-essential mux configuration,
so it doesn't make sense to have an "essential" prefix.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
diff --git a/board/ti/am57xx/board.c b/board/ti/am57xx/board.c
index 63bacfb..67191af 100644
--- a/board/ti/am57xx/board.c
+++ b/board/ti/am57xx/board.c
@@ -335,7 +335,7 @@
 	return 0;
 }
 
-void set_muxconf_regs_essential(void)
+void set_muxconf_regs(void)
 {
 	do_set_mux32((*ctrl)->control_padconf_core_base,
 		     early_padconf, ARRAY_SIZE(early_padconf));