tegra132: Remove clamp_tristate_inputs() call

As per NV SysEng, setting PINMUX_CLAMP_INPUTS=1 is now
considered a bad thing. It clamps _all_ tristated inputs
to zero, and isn't really the panacea for duplicated pinmux
mappings as was stated previously.

BUG=None
BRANCH=None
TEST=Built both Rush and Ryu OK. Tested on Rush, booted kernel
OK.

Change-Id: I566c4516b34686b744a47a2b0c18c4b801456727
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/224032
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/nvidia/tegra132/bootblock.c

@@ -63,9 +63,6 @@ void main(void)
 {
 	void *entry = NULL;
 
-	// enable pinmux clamp inputs
-	clamp_tristate_inputs();
-
 	// enable JTAG at the earliest stage
 	enable_jtag();