[Multilib] Add more arm32/aarch64 variants

Adding ARMv7a no-fp variant and AArch64[-nofp] PACRET[-BKEY][-BTI] Variants

Signed-off-by: Zhaoshi Zheng <zhaoshiz@qti.qualcomm.com>
(cherry picked from commit 11f55f1)

Author: zhaoshiz

qualcomm-software/embedded-multilib/json/multilib.json

@@ -51,6 +51,11 @@
             "flags": "--target=riscv32-unknown-unknown-elf -march=rv32imac -mabi=ilp32",
             "libraries_supported": "picolibc"
         },
+        {
+            "variant": "armv7a_soft_nofp",
+            "json": "armv7a_soft_nofp.json",
+            "flags": "--target=thumbv7-unknown-none-eabi -mfpu=none -fno-exceptions"
+        },
         {
             "variant": "riscv32imac_ilp32_nopic",
             "json": "riscv32imac_ilp32_nopic.json",