libpayload: Support functions for Geode

The Geode video driver will require a number of support functions,
including udelay(), PCI bus walking and MSRs.  This adds those functions
in preparation for the actual code.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3231 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/include/libpayload.h

@@ -170,6 +170,7 @@ void lib_get_sysinfo(void);
 /* Timer functions - defined by each architecture. */
 unsigned int get_cpu_speed(void);
 void ndelay(unsigned int n);
+void udelay(unsigned int n);
 void mdelay(unsigned int n);
 void delay(unsigned int n);