x86: Rename e820entry to e820_entry

This changes 'struct e820entry' to 'struct e820_entry' to conform
with the coding style.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
diff --git a/arch/x86/cpu/qemu/e820.c b/arch/x86/cpu/qemu/e820.c
index 11409dd..ec733cb 100644
--- a/arch/x86/cpu/qemu/e820.c
+++ b/arch/x86/cpu/qemu/e820.c
@@ -10,7 +10,7 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 unsigned int install_e820_map(unsigned int max_entries,
-			      struct e820entry *entries)
+			      struct e820_entry *entries)
 {
 	entries[0].addr = 0;
 	entries[0].size = ISA_START_ADDRESS;