ARC: tests fail on nsim_hs with one register bank

[evgeniy-paltsev]

Describe the bug
If we configure nsim_hs to have one register bank we'll get significant amount of tests failed.

To Reproduce
Steps to reproduce the behavior:

Apply this patch (I've tested it on top of b2bd0a0 commit):

diff --git a/boards/arc/nsim/support/nsim_hs.props b/boards/arc/nsim/support/nsim_hs.props
index 59a4f6a9c5..b79d4a3de1 100644
--- a/boards/arc/nsim/support/nsim_hs.props
+++ b/boards/arc/nsim/support/nsim_hs.props
@@ -1,8 +1,7 @@
        nsim_isa_family=av2hs
        nsim_isa_core=2
        arcver=0x52
-       nsim_isa_rgf_num_banks=2
-       nsim_isa_rgf_banked_regs=32
+       nsim_isa_rgf_num_banks=1
        nsim_isa_rgf_num_regs=32
        nsim_isa_rgf_num_wr_ports=2
        nsim_isa_big_endian=0
diff --git a/soc/arc/snps_nsim/Kconfig.defconfig.hs b/soc/arc/snps_nsim/Kconfig.defconfig.hs
index a1fd90572f..f46ee92cb9 100644
--- a/soc/arc/snps_nsim/Kconfig.defconfig.hs
+++ b/soc/arc/snps_nsim/Kconfig.defconfig.hs
@@ -13,7 +13,7 @@ config NUM_IRQS
        default 30
 
 config RGF_NUM_BANKS
-       default 2
+       default 1
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC
        default 5000000

Run sanitycheck:

./scripts/sanitycheck --platform nsim_hs

Expected behavior
0 test fail.

Logs and console output

sanitycheck results:

INFO    - Total complete:  240/ 240  100%  skipped:   70, failed:   53
INFO    - 117 of 170 tests passed (68.82%), 53 failed, 794 skipped with 0 warnings in 2310.51 seconds
INFO    - In total 1058 test cases were executed on 1 out of total 302 platforms (0.33%)
INFO    - 153 tests executed on platforms, 17 tests were only built.

Environment (please complete the following information):

• OS: Linux
• Toolchain: Zephyr SDK 0.11.4
• Commit SHA: b2bd0a0 with patch applied

[evgeniy-paltsev]

Hi @IRISZZW,
as you've fixed similar #26688 could you please also look at this one?

Thanks.