uclibc-compat: fix __aeabi_d2iz infinite recursion

[widgetii]

Problem

__aeabi_d2iz in libuclibc-compat.so caused a stack overflow (infinite recursion). GCC converts (int)x to a call to __aeabi_d2iz — which is the function itself.

Found via AddressSanitizer on hi3516cv100 hardware (128MB RAM, osmem=96M for ASAN headroom):

==821==ERROR: AddressSanitizer: stack-overflow on address 0xbe520ff8
    #0 0x400b4894  (/usr/lib/libuclibc-compat.so+0x894)

Disassembly confirmed the recursion:

__aeabi_d2iz:
    push {r4, lr}
    bl   __aeabi_d2iz@plt    ; calls itself!
    pop  {r4, pc}

Fix

Replace with manual IEEE 754 double field extraction using only integer operations.

Test plan

• ASAN build of majestic passes hisi_free_mem_ex (was crashing here)
• Sensor initializes: "Sony IMX122 Sensor Initial OK!"
• SDK starts: "HiSilicon SDK started"
• Full hardware test after toolchain rebuild + firmware build

Ref: #1992