cargo-update-recipe-crates: small improvements

* use 4 spaces
* avoid trailing space
* add CARGO_LOCK_SRC_DIR to allow searching outside ${S}
* use BPN in output filename
* First I've used CARGO_LOCK_SRC_DIR as relative to ${S}, because that's what CARGO_SRC_DIR
  in cargo.bbclass is using:
  meta/classes-recipe/cargo.bbclass:CARGO_SRC_DIR ??= ""
  meta/classes-recipe/cargo.bbclass:MANIFEST_PATH ??= "${S}/${CARGO_SRC_DIR}/Cargo.toml"

  but change to absolute path (defaulting to ${S}) as requested by Alex:
  11:44 < kanavin> JaMa, would prefer CARGO_LOCK_SRC_DIR ??= "${S}"
  11:46 < kanavin> otherwise looks good

* I've resolved my usecase for CARGO_LOCK_SRC_DIR by changing
  S back to ${WORKDIR}/git and using CARGO_SRC_DIR to select
  the right subdirectory to be built, because the Cargo.toml
  in this subdirectory was also referencing other subdirectories
  with relative path:
  https://github.com/solana-labs/solana-program-library/blob/88b147506d5b9515f3a4762421a0b8c309188dc9/token/cli/Cargo.toml#L30
  so including all Cargo.lock files in whole ${WORKDIR}/git
  seems like reasonable approach

(From OE-Core rev: 7636a2b8080521ed2ad54b0edce47a8742a12d58)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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