tpm2-tss: fix build with musl

tpm2-tss: fix build with musl

Add a missing <sys/select.h> inclusion, needed for the definition of the
fd_set type. This patch can't be sent upstream because the changed file
does not exist anymore on the master branch.

Fixes:
  http://autobuild.buildroot.net/results/09e8b3b85d7113d60e8967a2d41a6aea8f8197c0
  http://autobuild.buildroot.net/results/2e4c70f2f1239eb19235ae04a936a6492daf316d
  http://autobuild.buildroot.net/results/bbd68f52781da735e983b1260de5b804787374b1

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>