components: libc: fix pointer-to-integer cast warnings and address tr…

[KennethLiu61]

…uncation

[Problem Description]

1. When enabling RT_USING_MODULE=y, compilation warnings occur: dlelf.c:386:27: warning: cast from pointer to integer of different size dlelf.c:398:25: warning: cast from pointer to integer of different size dlelf.c:408:24: warning: cast from pointer to integer of different size

2. On RV64 architectures (e.g. Sophgo SG2042 with RISC-V Sv39 and 40-bit physical addressing), dlsym may fail when accessing addresses beyond 32-bit range.

[Root Cause]
In dlmodule_load_relocated_object() and dlmodule_symbol_find(), pointer is cast to rt_uint32_t which truncates:
| rt_ubase_t rodata_addr = (rt_uint32_t)ptr;
This causes:

• Warnings on 64-bit systems (pointer width > 32-bit)
• Actual address truncation on RV64 when physical address exceeds 32-bit

[Solution]
Replace rt_uint32_t with architecture-adaptive rt_ubase_t: | rt_ubase_t rodata_addr = (rt_ubase_t)ptr;
The rt_ubase_t is defined in include/rttypes.h as: | #ifdef ARCH_CPU_64BIT
| typedef rt_uint64_t rt_ubase_t;
| #else
| typedef rt_uint32_t rt_ubase_t;
| #endif
This ensures correct width casting for both 32/64-bit architectures.

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