Revert "Disable CUDA fusion by default for now (ikawrakow#903)"

This reverts commit 320fc60.

Author: Nexesenex

ggml/CMakeLists.txt

@@ -133,7 +133,7 @@ option(GGML_CUDA_NO_PEER_COPY               "ggml: do not use peer to peer copie
 option(GGML_CUDA_NO_VMM                     "ggml: do not try to use CUDA VMM"                OFF)
 option(GGML_CUDA_FA_ALL_QUANTS              "ggml: compile all quants for FlashAttention"     OFF)
 option(GGML_CUDA_USE_GRAPHS                 "ggml: use CUDA graphs (llama.cpp only)"          ON)
-set   (GGML_CUDA_FUSION  "0" CACHE STRING   "ggml: enable/disable fusion")
+set   (GGML_CUDA_FUSION  "1" CACHE STRING   "ggml: enable/disable fusion")
 
 option(GGML_IQK_FLASH_ATTENTION             "ggml: enable the IQK FlashAttention CPU kernels" ON)
 option(GGML_IQK_FA_ALL_QUANTS               "ggml: compile all quants for IQK FlashAttention" OFF)