omap1: omap7xx clocks, mux, serial fixes

This change adds in the necessary clocks and mux pins for UART
control on omap7xx devices.  I also made a change in the serial
code to only try and initialize two UARTs in omap_serial_init, as
these devices don't have three.

Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap1/mux.c b/arch/arm/mach-omap1/mux.c
index 8434137..6a9b42f 100644
--- a/arch/arm/mach-omap1/mux.c
+++ b/arch/arm/mach-omap1/mux.c
@@ -70,6 +70,10 @@
 MUX_CFG_7XX("SPI_7XX_4",           6,   17,    4,   16,   1, 0)
 MUX_CFG_7XX("SPI_7XX_5",           8,   25,    0,   24,   0, 0)
 MUX_CFG_7XX("SPI_7XX_6",           9,    5,    0,    4,   0, 0)
+
+/* UART pins */
+MUX_CFG_7XX("UART_7XX_1",          3,   21,    0,   20,   0, 0)
+MUX_CFG_7XX("UART_7XX_2",          8,    1,    6,    0,   0, 0)
 };
 #define OMAP7XX_PINS_SZ		ARRAY_SIZE(omap7xx_pins)
 #else