Fix undefined IRQ_MASK/FIQ_MASK in Cortex-A GNU/AC6 ports with VFP enabled

[mehmetteren]

Description

This PR fixes a compilation error in tx_thread_schedule.S for ARM Cortex-A ports (GNU and AC6) when TX_ENABLE_VFP_SUPPORT is defined.

When VFP support is enabled, the context restore logic at the end of the scheduling loop attempts to use IRQ_MASK and FIQ_MASK to manage interrupt state. However, these symbols are not defined in the assembly files, leading to build failures:
undefined symbol IRQ_MASK used as an immediate value

This issue appears to be present across multiple Cortex-A ports (GNU and AC6). This PR adds the missing definitions (IRQ_MASK = 0x80, FIQ_MASK = 0x40) to the affected files.

Fix

Added local definitions for IRQ_MASK and FIQ_MASK in tx_thread_schedule.S. This aligns with the definitions found in tx_thread_interrupt_restore.S and enables successful compilation of the VFP context switch logic.

Validation

Hardware: Xilinx Zynq-7000 (ZC702)
Toolchain: GNU Arm Embedded Toolchain
Verification:

1. Configured BSP with -DTX_ENABLE_VFP_SUPPORT.
2. Encountered build failure due to missing symbols.
3. Applied the fix.
4. Validated successful compilation and basic context switching on hardware.

PR checklist

• Updated function header with a short description and version number
• Added test case for bug fix or new feature
• Validated on real hardware

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