Rename _I8259SpuriousIntCount to _i8259_spurious_interrupt_count

Updating global variable's name to follow a consistent naming convention.

Change accomplished with the following script:

   #!/bin/bash
   echo "Searching for ${1} to replace with ${2}"
   find ./ \( -name "*.[chs]" -o -name "sysgen.py" -o -name "*.kconf" -o -name "*.arch" \) \
            ! -path "./host/src/genIdt/*" \
            ! -path "*/outdir/*" | xargs sed -i 's/\b'${1}'\b/'${2}'/g';

Change-Id: Ifadb978e31770eb9f4987a3205483aad9a525b86
Signed-off-by: Yonattan Louise <yonattan.a.louise.mendoza@intel.com>

arch/x86/bsp/i8259Boi.s

@@ -56,7 +56,7 @@ a real IRQ has been inserted.
  	/* externs */
 
 	GTEXT(_IntExit)
-	GDATA(_I8259SpuriousIntCount)
+	GDATA(_i8259_spurious_interrupt_count)
 
 
 /*******************************************************************************
@@ -144,7 +144,7 @@ BRANCH_LABEL(check_isr)
 
 BRANCH_LABEL(spur_isr)
     /* An actual spurious interrupt. Increment counter and short circuit */
-    incl    _I8259SpuriousIntCount
+    incl    _i8259_spurious_interrupt_count
 
     /* Pop the return address */
     addl    $4, %esp

drivers/interrupt_controller/i8259.c

@@ -103,7 +103,7 @@ the last level acknowledged and serviced.
 /* globals */
 
 #ifndef CONFIG_SHUTOFF_PIC
-unsigned int _I8259SpuriousIntCount =
+unsigned int _i8259_spurious_interrupt_count =
 	0; /* track # of spurious interrupts */
 
 /*