ARM: tegra: pinmux naming consistency fixes

Clean up the naming of pinmux-related objects:
* Refer to drive groups rather than pad groups to match the Linux kernel.
* Ensure all pinmux API types are prefixed with pmux_, values (defines)
  are prefixed with PMUX_, and functions prefixed with pinmux_.
* Modify a few type names to make their content clearer.
* Minimal changes to SoC-specific .h/.c files are made so the code still
  compiles. A separate per-SoC change will be made immediately following,
  in order to keep individual patch size down.

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 9e34c8b..4c89995 100644
--- a/arch/arm/cpu/tegra20-common/pinmux.c
+++ b/arch/arm/cpu/tegra20-common/pinmux.c
@@ -283,7 +283,7 @@
 
 #define PMUX_FUNC_RSVD PMUX_FUNC_RSVD1
 
-static const struct tegra_pingroup_desc tegra20_pingroups[] = {
+static const struct pmux_pingrp_desc tegra20_pingroups[] = {
 	PIN(ATA,  NAND,  IDE,    NAND,   GMI,       RSVD,        IDE),
 	PIN(ATB,  NAND,  IDE,    NAND,   GMI,       SDIO4,       IDE),
 	PIN(ATC,  NAND,  IDE,    NAND,   GMI,       SDIO4,       IDE),
@@ -434,4 +434,4 @@
 	PINALL(XM2D,  DDR,   RSVD, RSVD, RSVD, RSVD,  RSVD, MUXCTL_NONE,
 		PUCTL_NONE),
 };
-const struct tegra_pingroup_desc *tegra_soc_pingroups = tegra20_pingroups;
+const struct pmux_pingrp_desc *tegra_soc_pingroups = tegra20_pingroups;