[libc] Enable the acoshf math function on AMD GPUs (llvm#152157)

This patch adds the `acoshf` math function to the AMDGPU build.

Author: leandrolcampos

libc/config/gpu/amdgpu/entrypoints.txt

@@ -282,6 +282,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     # math.h entrypoints
     libc.src.math.acos
     libc.src.math.acosf
+    libc.src.math.acoshf
     libc.src.math.asin
     libc.src.math.asinf
     libc.src.math.asinhf