meta-ti/all: set S from UNPACKDIR in recipes that fetch prebuilt files

There is no need to have two assignments; also setting S from
UNPACKDIR (and not vice versa) is more logical as unpack
task comes first, and tasks that come after unpack use S to access
unpack results.

Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/recipes-bsp/vis-fw/vis_01.50.07.15.bb

@@ -11,8 +11,7 @@ SRC_URI = "http://downloads.ti.com/dsps/dsps_public_sw/glsdk/vis/01_50_07_15/exp
 SRC_URI[md5sum] = "fe8b00e398fb3b7ada0c15b601867acb"
 SRC_URI[sha256sum] = "6e2aa47ae892910616ebdc96646af778af9a59ca0657716ab4fa4b24a9afae69"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 DSPAPP = "dra7-dsp1-fw-radio.xe66"
 GPPAPP = "RadioApp"

meta-ti-extras/recipes-ti/devtools/ti-cgt-pru_2.3.3.bb

@@ -24,8 +24,7 @@ SRC_URI[cgt-pru-x86.sha256sum] = "1f1405167214f2c0ef848591b17a7799fdcd9f55f11bc9
 SRC_URI[cgt-pru-arm.md5sum] = "648a6d7d8162fd6a89f381c7b974e6b0"
 SRC_URI[cgt-pru-arm.sha256sum] = "8390cb77b46b728ce2940595b81406f76d86dfed58c21258e3206a7c1232ccf2"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_install() {
     install -d ${D}${TI_CGT_PRU_INSTALL_DIR_RECIPE}