evm: remove TCG_TPM dependency

All tristates selected by EVM(boolean) are forced to be builtin, except
in the TCG_TPM(tristate) dependency case. Arnaud Lacombe summarizes the
Kconfig bug as, "So it would seem direct dependency state influence the
state of reverse dependencies.."  For a detailed explanation, refer to
Arnaud Lacombe's posting http://lkml.org/lkml/2011/8/23/498.

With the "encrypted-keys: remove trusted-keys dependency" patch, EVM
can now be built without a dependency on TCG_TPM.  The trusted-keys
dependency requires trusted-keys to either be builtin or not selected.
This dependency will prevent the boolean/tristate mismatch from
occuring.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>,
             Randy Dunlap <rdunlap@xenotimenet>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>

security/integrity/evm/Kconfig

 config EVM
 	boolean "EVM support"
-	depends on SECURITY && KEYS && TCG_TPM
+	depends on SECURITY && KEYS && (TRUSTED_KEYS=y || TRUSTED_KEYS=n)
 	select CRYPTO_HMAC
 	select CRYPTO_MD5
 	select CRYPTO_SHA1
 	select ENCRYPTED_KEYS
-	select TRUSTED_KEYS
 	default n
 	help
 	  EVM protects a file's security extended attributes against