MIPS: Refactor GIC clocksource code.

Reorganize some of the GIC clocksource driver code. Below is a list of
the various changes.

  * No longer select CSRC_GIC by default for Malta platform.
  * Limit choice for either the GIC or R4K clocksource, not both.
  * Change location in Makefile.
  * Created new 'gic_read_count' function in common 'irq-gic.c' file.
  * Change 'git_hpt_read' function in 'csrc-gic.c' to use new function.
  * Surround GIC specific code in Malta platform code with #ifdef's.
  * Only initialize the GIC clocksource if it was selected. Original
    code called it unconditionally if a GIC was found.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 79bc56c..4b62305 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -337,6 +337,7 @@
 	select BOOT_RAW
 	select CEVT_R4K
 	select CSRC_R4K
+	select CSRC_GIC
 	select CPU_MIPSR2_IRQ_VI
 	select CPU_MIPSR2_IRQ_EI
 	select DMA_NONCOHERENT