Fix usage for KVM mode

Lowercase m is for memory, whereas mode is an uppercase M.

Change-Id: I33bc4a785b3783ccb6bad727d5cc8d5f4c28ebca
diff --git a/aarch64/run_qemu.sh b/aarch64/run_qemu.sh
index 95e0798..a807d13 100755
--- a/aarch64/run_qemu.sh
+++ b/aarch64/run_qemu.sh
@@ -45,7 +45,7 @@
 
 Usage: $0 [-h] [-v] [-K]
        [-e QEMU] [-L ROM_DIR] [-k KERNEL] [-r ROOTFS] [-R DRIVE] [-F FIRMWARE]
-       [-c CPU] [-s NUM_CPUS] [-m MEM] [-g GIC] [-m KVM_MODE] [-G]
+       [-c CPU] [-s NUM_CPUS] [-m MEM] [-g GIC] [-M KVM_MODE] [-G]
        [-t TIMEOUT] [-a APPEND]
 
     -h    output this help text
@@ -60,7 +60,7 @@
     -s    number of CPU cores (defaults to ${DEFAULT_SMP})
     -m    amount of memory in MB (defaults to ${DEFAULT_RAM})
     -g    version of GIC (defaults to ${DEFAULT_GIC})
-    -m    KVM mode (defaults to 'pkvm', other: 'vhe', 'nvhe')
+    -M    KVM mode (defaults to 'pkvm', other: 'vhe', 'nvhe')
     -a    append to kernel command line
     -G    enable debugging of emulated system with GDB
     -t    kill QEMU after given number of seconds