ARM: tegra: pinctrl: make pmux_func values consistent on Tegra20

For consistency with other SoCs, modify Tegra20's enum pmux_func to:

* Remove PMUX_FUNC values that aren't real
* Use the same PMUX_FUNC_RSVD[1-4] values, and ensure (RSVD1 & 3)==0;
  this will be assumed by pinmux_set_func() in a future patch.

Unfortunately, PMUX_FUNC_RSVD is still used in the pin macros. Use a
private define inside the driver to prevent this from causing compilaton
errors. This will be cleaned up when the pin tables are re-written in a
later patch in this series.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/arch/arm/cpu/tegra20-common/pinmux.c b/arch/arm/cpu/tegra20-common/pinmux.c
index 40301e1..14467f0 100644
--- a/arch/arm/cpu/tegra20-common/pinmux.c
+++ b/arch/arm/cpu/tegra20-common/pinmux.c
@@ -307,7 +307,9 @@
 
 /* A pin group number which is not used */
 #define PIN_RESERVED \
-	PIN(NONE, NONE, NONE, NONE, NONE, NONE, NONE)
+	PIN(NONE, NONE, RSVD, RSVD, RSVD, RSVD, RSVD)
+
+#define PMUX_FUNC_RSVD ((enum pmux_func)-1)
 
 const struct tegra_pingroup_desc tegra_soc_pingroups[PINGRP_COUNT] = {
 	PIN(ATA,  NAND,  IDE,    NAND,   GMI,       RSVD,        IDE),