x86: MMU: Set PAE page tables for QEMU as default.

Replacing the default paging scheme from 32-bit paging to
PAE paging in QEMU.

JIRA:ZEP-2511

Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
diff --git a/boards/x86/qemu_x86/qemu_x86_defconfig b/boards/x86/qemu_x86/qemu_x86_defconfig
index ff283f8..9b0f241 100644
--- a/boards/x86/qemu_x86/qemu_x86_defconfig
+++ b/boards/x86/qemu_x86/qemu_x86_defconfig
@@ -20,3 +20,5 @@
 CONFIG_HW_STACK_PROTECTION=y
 CONFIG_USERSPACE=y
 CONFIG_APPLICATION_MEMORY=y
+CONFIG_X86_PAE_MODE=y
+