wolfcrypt/src/wc_pkcs11.c: cache PKCS#11 session across multi-call HMAC #6054

Job	Run time
build library (--disable-asm --enable-mlkem --enable-lms --enable-xmss --enable-mldsa)	33s
build library (--enable-intelasm --enable-sp-asm)	32s
build library (--enable-intelasm --enable-sp-asm --enable-all-crypto --enable-mlkem --enable-lms ...	1m 16s
build library (--disable-asm --enable-all-crypto --enable-mlkem --enable-lms --enable-xmss --enab...	1m 7s
build library (--disable-asm)	38s
build library (--enable-intelasm --enable-sp-asm --enable-mlkem --enable-lms --enable-xmss --enab...	38s
	4m 44s

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