Require rocFFT use hip-config.cmake to find HIP

[littlewu2508]

Sometimes rocFFT use FindHIP.cmake which is not desired -- it does not have hip::device and hip::host target imported and result in cmake generating error.

Reference: https://bugs.gentoo.org/932155

[cgmb]

[FindHIP.cmake] does not have hip::device and hip::host target imported and result in cmake generating error.

There were some discussions ages ago about making FindHIP.cmake do a find_package(hip CONFIG) itself to fix this, but I guess the discussion never ended up leading to action. We should probably enhance FindHIP to eliminate this problem for all libraries and programs that use HIP.