feat: smart: user space context optimization

This patch optimizes the user-space context handling in the ARM64
architecture, specifically improving how the context is saved and
restored during system calls and interrupts. The changes make the
code more efficient and easier to maintain, while ensuring proper
preservation of user context during system transitions.

Changes:
- Introduced a parameter for context saving to improve flexibility.
- Replaced hardcoded stack pointer operations with frame-relative
  references for better readability and code reuse.
- Simplified context restoration, removing redundant operations like
  loading/storing floating-point registers.

Signed-off-by: Shell <[email protected]>

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