By Jeffrey Dastin and Max A. Cherney SAN FRANCISCO, April 1 (Reuters) - Chipmaker Intel has planned to invest another $15 million in SambaNova, a chip startup chaired by Intel CEO Lip-Bu Tan, a Reuters review of corporate records showed. The investment, subject to regulatory approval, would increase Intel's ownership of SambaNova to 9%, the review showed. ‌The backing follows another $35 million that Intel put into SambaNova in February, which, along with other financing, had boosted Intel’s stake in the ...