Fix build breaks for all architectures by adding RngLib mapping.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Abner Chang <abner.chang@hpe.com>
Cc: Daniel Schaefer <daniel.schaefer@hpe.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Daniel Schaefer <daniel.schaefer@hpe.com>
---
 SignedCapsulePkg/SignedCapsulePkg.dsc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/SignedCapsulePkg/SignedCapsulePkg.dsc b/SignedCapsulePkg/SignedCapsulePkg.dsc
index 2152d3d15668..8a27207a6f20 100644
--- a/SignedCapsulePkg/SignedCapsulePkg.dsc
+++ b/SignedCapsulePkg/SignedCapsulePkg.dsc
@@ -93,6 +93,7 @@ [LibraryClasses]
   EdkiiSystemCapsuleLib|SignedCapsulePkg/Library/EdkiiSystemCapsuleLib/EdkiiSystemCapsuleLib.inf
   IniParsingLib|SignedCapsulePkg/Library/IniParsingLib/IniParsingLib.inf
   PlatformFlashAccessLib|SignedCapsulePkg/Library/PlatformFlashAccessLibNull/PlatformFlashAccessLibNull.inf
+  RngLib|MdePkg/Library/BaseRngLib/BaseRngLib.inf
 
 [LibraryClasses.ARM]
   ArmSoftFloatLib|ArmPkg/Library/ArmSoftFloatLib/ArmSoftFloatLib.inf
@@ -108,6 +109,12 @@ [LibraryClasses.AARCH64, LibraryClasses.ARM]
   # Add support for GCC stack protector
   NULL|MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf
 
+[LibraryClasses.ARM]
+  RngLib|MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.inf
+
+[LibraryClasses.RISCV64]
+  RngLib|MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.inf
+
 [LibraryClasses.common.PEI_CORE]
   HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
   MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
--
2.32.0.windows.1