Add filesystem drivers

Add EXT2/EXT4, exFAT, NTFS filesystem drivers.
Do not add ISO9115 drivers as it breaks El Torito boot.

FSDrivers/ext4.inf

@@ -0,0 +1,25 @@
+# EXT4 filesystem driver. See */LICENSE.txt for details.
+# https://www.rodsbooks.com/refind/ v0.12
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = ext4
+  FILE_GUID                      = 9d380387-a15a-4053-ae19-ff3495b6d0d5
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
+#
+
+VALID_ARCHITECTURES           = X64 IA32
+
+[Binaries.X64]
+  PE32|X64/ext4_x64.efi|*
+
+[Binaries.IA32]
+  PE32|IA32/ext4_ia32.efi|*
+