port-riscv/59301: riscv: missing MKPROFILE=yes support

[campbell+netbsd%mumble.net@localhost]

>Number:         59301
>Category:       port-riscv
>Synopsis:       riscv: missing MKPROFILE=yes support
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-riscv-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 16 01:45:00 +0000 2025
>Originator:     Taylor R Campbell
>Release:        current
>Organization:
The ProfileBSD Riscvation
>Environment:
>Description:
We always set MKPROFILE=no on riscv:

    930 # No profiling for or1k or risc-v (yet)
    931 MKPROFILE.or1k=	no
    932 MKPROFILE.riscv32=no
    933 MKPROFILE.riscv64=no

https://nxr.netbsd.org/xref/src/share/mk/bsd.own.mk?r=1.1414#930
>How-To-Repeat:
cc -pg

cd /usr/tests/usr.bin/cc
atf-run t_hello:hello_profile | atf-report
>Fix:
Yes, please!