payloads/libpayload/arch/arm64/mmu.c: Fix typo in comment

Change-Id: Ieb10a881ef1d983f11318f0f6934491fd19fd0bf
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50268
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c
index bc4c233..4c8f8c1 100644
--- a/payloads/libpayload/arch/arm64/mmu.c
+++ b/payloads/libpayload/arch/arm64/mmu.c
@@ -389,7 +389,7 @@
 
 /*
  * Func: mmu_is_range_free
- * Desc: We need to ensure that the new range being allocated doesnt overlap
+ * Desc: We need to ensure that the new range being allocated doesn't overlap
  * with any used memory range. Basically:
  * 1. Memory ranges used by the payload (usedmem_ranges)
  * 2. Any area that falls below _end symbol in linker script (Kernel needs to be