OvmfPkg: sync FADT with QEMU: clear DAY_ALRM

"RTC day of the month alarm feature is not supported".

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13614 6f19259b-4bc3-4df7-8a09-765794883524
MU SOURCE COMMIT:5bf66edf13e7a084404bf150be2e0010afdf60d5

Platforms/OvmfPkg/AcpiTables/Platform.h

@@ -55,7 +55,7 @@
 #define FLUSH_STRIDE    0x0000
 #define DUTY_OFFSET     0x00
 #define DUTY_WIDTH      0x00
-#define DAY_ALRM        0x0D
+#define DAY_ALRM        0x00
 #define MON_ALRM        0x00
 #define CENTURY         0x00
 #define FLAG            EFI_ACPI_1_0_WBINVD | EFI_ACPI_1_0_PROC_C1 | EFI_ACPI_1_0_SLP_BUTTON | EFI_ACPI_1_0_RTC_S4 | EFI_ACPI_1_0_TMR_VAL_EXT