OvmfPkg: fold macros of unsupported PM2 control reg. block into Facp.aslc

Soon we're going to specify Extended Addresses of register blocks in
Generic Address Structure format. The GAS is easy to fill if we want to
posit either "unsupported" (all zero) or a given address in a specific
address space. However deriving "unsupported" just from a macro expanding
to zero is unwieldy, so let's avoid the need.

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@14153 6f19259b-4bc3-4df7-8a09-765794883524
MU SOURCE COMMIT:1e69186a23d08399ed6245c74fb501e1bc49aaf3

Platforms/OvmfPkg/AcpiTables/Facp.aslc

@@ -41,13 +41,13 @@ EFI_ACPI_1_0_FIXED_ACPI_DESCRIPTION_TABLE FACP = {
   0,                // Power Mgt 1b Event Reg Blk unsupported
   PM1a_CNT_BLK,     // Port address of Power Mgt 1a Ctrl Reg Blk
   0,                // Power Mgt 1b Ctrl Reg Blk unsupported
-  PM2_CNT_BLK,      // Port address of Power Mgt 2  Ctrl Reg Blk
+  0,                // Power Mgt 2  Ctrl Reg Blk unsupported
   PM_TMR_BLK,       // Port address of Power Mgt Timer Ctrl Reg Blk
   GPE0_BLK,         // Port addr of General Purpose Event 0 Reg Blk
   GPE1_BLK,         // Port addr of General Purpose Event 1 Reg Blk
   PM1_EVT_LEN,      // Byte Length of ports at pm1X_evt_blk
   PM1_CNT_LEN,      // Byte Length of ports at pm1X_cnt_blk
-  PM2_CNT_LEN,      // Byte Length of ports at pm2_cnt_blk
+  0,                // Power Mgt 2 Ctrl Reg Blk unsupported
   PM_TM_LEN,        // Byte Length of ports at pm_tm_blk
   GPE0_BLK_LEN,     // Byte Length of ports at gpe0_blk
   GPE1_BLK_LEN,     // Byte Length of ports at gpe1_blk

Platforms/OvmfPkg/AcpiTables/Platform.h

@@ -36,13 +36,11 @@
 #define S4BIOS_REQ      0x00
 #define PM1a_EVT_BLK    0x0000b000
 #define PM1a_CNT_BLK    0x0000b004
-#define PM2_CNT_BLK     0x00000000
 #define PM_TMR_BLK      0x0000b008
 #define GPE0_BLK        0x0000afe0
 #define GPE1_BLK        0x00000000
 #define PM1_EVT_LEN     0x04
 #define PM1_CNT_LEN     0x02
-#define PM2_CNT_LEN     0x00
 #define PM_TM_LEN       0x04
 #define GPE0_BLK_LEN    0x04
 #define GPE1_BLK_LEN    0x00