x86: rename find_max_pfn() to propagate_e820_map()

this function doesnt just 'find' the max_pfn - it also has
other side-effects such as registering sparse memory maps.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 5b0bffb..1c4799e 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -812,10 +812,10 @@
 		efi_init();
 
 	/* update e820 for memory not covered by WB MTRRs */
-	find_max_pfn();
+	propagate_e820_map();
 	mtrr_bp_init();
 	if (mtrr_trim_uncached_memory(max_pfn))
-		find_max_pfn();
+		propagate_e820_map();
 
 	max_low_pfn = setup_memory();