package/oprofile: drop custom install rules

Drop custom install rules which were added since commit
676797d5. Indeed, they result in a
broken installation. Especially, they are trying to "guess" what must
be installed based on BR2_ARCH but oprofile has its own logic. For
example, goldmont microarchitecture files must be installed in i386
directory even if this architecture is 64 bits:
https://sourceforge.net/p/oprofile/oprofile/ci/0ad5a9e6af86a88e1dd41180f45bc48b646eba6a

This will result in the following runtime failure:

oprofile: could not open unit mask description file /usr/share/oprofile//i386/goldmont/unit_masks
Unable to find info for event cpu_clk_unhalted

Fixes:
 - https://bugs.buildroot.org/show_bug.cgi?id=14641



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>